454 Mr. E. A. Smith oh the 



1. Microcystis hunguranensis. (PI. XVI. fig. 1.) 



Testa minuta, obtuse conoidea, angustissime perforata, polita, satu- 

 rate olivaceo-fusca, tenuis, pellucida ; spira breviter obtuse conica ; 

 anfractus 5^, lente crescentes, leviter striatuli, ultimus ad peri- 

 pheriam rotundatus, baud descendens ; apertura parva, lunata ; 

 peristoma tenue, simplex, margine columellari anguste reflexo. 



Diam. 2*5 millim., alt. 2 ; apertura 1 lata. 



I lab. Bunguran. 



A liiglily polished species of a dark olive-brown colour. 



2. Everettia cinnamomea^ Eydoux. 



Helix cinufimoynea (Valenciennes, MS.), Eydoux, Mag. de Zool. 1838, 

 pi. cxvi. figs. 1-15; Pfeiffer, Men. Hel.' i. p. o4, iv. p. 42; Tryon, 

 Man. Conch, ser. 2, vol. ii. p. 89, pi. xxix. figs. 46-48 (copied from 

 Eydoux), as Nanina. 



Ilah. Natuna Islands {Eydoux and Struhell in lift.) ; 

 Penang {Pfr.) ; Bunguran and Sirhassen {Everett). 



The shell figured by Reeve (Conch. Icon. vol. vii. fig. 442) 

 does not belong to this species, being perfectly distinct in 

 form. The figure given by Eydoux is very good as regards 

 form, but the colour in the copy of the work at hand is rather 

 too red. 



The examples from Sirhassen are not so large as those 

 from Bunguran, and they have half a whorl less ; but 

 whether they are full-grown or not I am unable to say. 

 They also differ in having the under surface of a more or less 

 greenish tint. 



3. Nanina {Remiplecta) Humphreysiana^ Lea. 



Hah. Bunguran and Sirhassen [Everett) ; Natuna Islands 

 [Struhell in Hit.) ] Malacca [auct.). 



There are two varieties of this species occurring at Sir- 

 hassen, one fairly well represented by the figure in the Conch. 

 Cab. ed. 2, pi. xxxi. figs. 3, 5, of Helix. This form also 

 occurs at Bunguran. Tlie dark zone beneath the ])ale peri- 

 phery is, however, generally more defined, and the upjier 

 surface is sometimes darker than the specimen figured. The 

 second variety is entirely white, but covered with a light 

 olive-yellow epidermis. It may be named var. jyallida. 



4. Dyakia hugonis, Pfeiffer. 

 ri'eiffer, Godwin-Austen, P. Z. S 



J J ah. Bunguran (Everett) • N. Borneo and Labuan [auct.). 



Dyakia Jnujouis, Pleiffer, Godwin-Austen, P. Z. S. 1891, p. 29, pi. v. 



tiffs, o-o //. 



